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Stacked, symmetrical, flexure pivot bearing

Publishing Venue

IBM

Abstract

This invention reveals a new pivot design that relies on flexures to provide rotational motion. Three of these flexure bearings are stacked to provide sufficient rotation range of motion for use in a hard disk drive actuator. Each flexure bearing is a one piece design. The design is symmetrical along three orthogonal axes to prevent the creation of actuator resonances arising from any asymmetric boundary condition.

Country

United States

Language

English (United States)

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Stacked, symmetrical, flexure pivot bearing

This invention reveals a new pivot design that relies on flexures to providerotational motion. Three of these flexure bearings are stacked to providesufficient rotation range of motion for use in a hard disk drive actuator. Eachflexure bearing is a one piece design. The design is symmetrical along threeorthogonal axes to prevent the creation of actuator resonances arising from anyasymmetric boundary condition.

The rotary flexure is a monolithic device, machined from a solid metal rod. It isdesigned for high radial and axial stiffnesses, low rotational stiffness and along fatigue life. The quad-foil rotary flexure has four radial, equally spacedthin plates that extend from and sleeve to the inner quad-lobed support, seefigure. By minimizing the distance from the inner terminus of the flexures tothe rotational axis the torsional stiffness is made as small as possible. Theplates can be notched to increase torsional flexibility. A constrained layerdamping material may be placed on the plate's surface to dampen vibrations. Thedevice flexes to provide rotation about a single axis through a range of +/-12degrees. The four lobes of the inner support are joined at the rotation axis toprovide an extremely rigid attachment for the flexure elements, thus allowinghigh radial and axial stiffnesses. To reduce the concentration of stresses,generous fillet radii were incorporated at the inner and outer ends of the fins.The quad-lobed su...